Treasury Stock	9 Months Ended
Sep. 30, 2013
Treasury Stock	(8) Treasury Stock The Board of Directors previously authorized the Company’s repurchase of up to an aggregate of $800.0 million of its class A common stock from time to time on the open market through April 29, 2013 (the “2005 Share Repurchase Program”). On April 25, 2013, the Board of Directors extended the term of the 2005 Share Repurchase Program through April 29, 2018, although the program may be suspended or discontinued by the Company at any time. The timing and amount of any shares repurchased will be determined by the Company’s management based on its evaluation of market conditions and other factors. The 2005 Share Repurchase Program may be funded using the Company’s working capital, as well as proceeds from any other funding arrangements that the Company may enter into in the future. During each of the three and nine months ended September 30, 2013 and 2012, the Company did not repurchase any shares of its class A common stock pursuant to the 2005 Share Repurchase Program. As of September 30, 2013, pursuant to the 2005 Share Repurchase Program, the Company had repurchased an aggregate of 3,826,947 shares of its class A common stock at an average price per share of $90.23 and an aggregate cost of $345.3 million. The average price per share and aggregate cost amounts disclosed above include broker commissions.

(8) Treasury Stock

The Board of Directors previously authorized the Company’s repurchase of up to an aggregate of $800.0 million of its class A common stock from time to time on the open market through April 29, 2013 (the “2005 Share Repurchase Program”). On April 25, 2013, the Board of Directors extended the term of the 2005 Share Repurchase Program through April 29, 2018, although the program may be suspended or discontinued by the Company at any time. The timing and amount of any shares repurchased will be determined by the Company’s management based on its evaluation of market conditions and other factors. The 2005 Share Repurchase Program may be funded using the Company’s working capital, as well as proceeds from any other funding arrangements that the Company may enter into in the future. During each of the three and nine months ended September 30, 2013 and 2012, the Company did not repurchase any shares of its class A common stock pursuant to the 2005 Share Repurchase Program. As of September 30, 2013, pursuant to the 2005 Share Repurchase Program, the Company had repurchased an aggregate of 3,826,947 shares of its class A common stock at an average price per share of $90.23 and an aggregate cost of $345.3 million. The average price per share and aggregate cost amounts disclosed above include broker commissions.